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Table 3 The number and the proportion of patients who met the criteria

From: The urethral position may shift due to urethral catheter placement in the treatment planning for prostate radiation therapy

Criteria

Direction

Number of patients at risk

Whole RT-CT slices

RT-CT slices at superior segment

RT-CT slices at middle segment

RT-CT slices at inferior segment

36 (25–54) slices

12 (8–18) slices

13 (9–18) slices

12 (8–18) slices

1 or more RT-CT slices

Anterior (+)

155

61 (39.4%)

41 (26.5%)

19 (12.3%)

24 (15.5%)

Posterior (−)

155

5 (3.2%)

4 (2.6%)

4 (2.6%)

2 (1.3%)

Left (+)

155

15 (10.3%)

12 (7.7%)

1 (0.6%)

3 (1.9%)

Right (−)

155

16 (9.7%)

15 (9.7%)

3 (1.9%)

1 (0.6%)

2D distance

155

84 (54.2%)

65 (41.9%)

40 (25.8%)

38 (24.5%)

10% or more RT-CT slices

Anterior (+)

155

51 (32.9%)

39 (25.2%)

17 (11.0%)

22 (14.2%)

Posterior (−)

155

4 (2.6%)

4 (2.6%)

3 (1.9%)

1 (0.6%)

Left (+)

155

11 (7.1%)

11 (7.1%)

1 (0.6%)

3 (1.9%)

Right (−)

155

7 (4.5%)

11 (7.1%)

2 (1.3%)

1 (0.6%)

2D distance

155

77 (49.7%)

62 (40.0%)

37 (23.9%)

34 (21.9%)

20% or more RT-CT slices

Anterior (+)

155

36 (23.2%)

38 (24.5%)

14 (9.0%)

18 (11.6%)

Posterior (−)

155

4 (2.6%)

4 (2.6%)

3 (1.9%)

1 (0.6%)

Left (+)

155

7 (4.5%)

8 (5.2%)

1 (0.6%)

2 (1.3%)

Right (−)

155

5 (3.2%)

10 (6.5%)

2 (1.3%)

1 (0.6%)

2D distance

155

56 (36.1%)

61 (39.4%)

31 (20.0%)

29 (18.7%)

50% or more RT-CT slices

Anterior (+)

155

9 (5.8%)

27 (17.4%)

9 (5.8%)

12 (7.7%)

Posterior (−)

155

1 (0.6%)

4 (2.6%)

1 (0.6%)

1 (0.6%)

Left (+)

155

0 (0.0%)

4 (2.6%)

1 (0.6%)

1 (0.6%)

Right (−)

155

1 (0.6%)

9 (5.8%)

0 (0.0%)

1 (0.6%)

2D distance

155

20 (12.9%)

51 (32.9%)

18 (11.6%)

22 (14.2%)

  1. The criteria were the number and the ratio of RT-CT slices in each patient which showed the calculated coordinate of the urethral catheter minus that of the guide-wire as 3.0 mm or larger in the corresponding direction